Add optional support for weasyprint

When the report is HTML, we could use weasyprint to convert to PDF.

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http://weasyprint.org/

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I think #5032 (closed) should be implemented first

Agreed.

Some work have been done by @resteve here:

https://bitbucket.org/trytonspain/trytond-html_report/src/e3dd6df1475dcf564417606ac39e38e1f535cb2f/html_report.py?at=default&fileviewer=file-view-default

It goes in the wrong direction. The HTML rendering should still use Genshi like we already do for email template in web_user.
Indeed the support will be very easy to add if effort is focused on #5032 (closed) instead of creating another engine.

Hello,

It would be interesting support different template engine (python, genshi, jinja2...) to render HTML reports.

Example:

class HTMLReport():
render_engine = "genshi" # or a new selection field in ir.action.report

@classmethod
def _engine_genshi(cls, ...):
...

@classmethod
def _engine_jinja2(cls, ...):):
...

In case don't like support jinja2 in core module (only genshi), allow to do with third modules.

Regards,

@Raimon,

Adding support for other templating engines is a different issue and not related to wsgi print. So feel free to open another discussion for it.

Indeed it can be don in third party modules by overriding the render method of Report.

I'm closing this issue because external module will be allowed to implement extend Report.render or Report.convert thanks to #4735 (closed)

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closed

I would like to re-open it because weasyprint is now considered as stable: https://weasyprint.org/news/ and because it probably support better the conversion of html into pdf. So I think it makes sense to have it as extra dependency and use it to convert html into pdf instead of soffice.

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reopened

Here is review266361002 which adds support for html to pdf conversions

assigned to @pokoli

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New review266361002 at https://codereview.tryton.org/266361002/#ps270591003

review266361002 updated at https://codereview.tryton.org/266361002/#ps288541002